IRJET- Optimum Location of Floating Column in Multistorey Building with Seismic Loading

International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 05 Issue: 10 | Oct 2018 www.irjet.net p-ISSN: 2395-0072
© 2018, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 971
OPTIMUM LOCATION OF FLOATING COLUMN IN MULTISTOREY
BUILDING WITH SEISMIC LOADING
Mr. Gaurav Pandey1, Mr. Sagar Jamle2
1M.Tech Scholar, Department of Civil Engineering, Oriental University, Indore, India
2Assistant Professor, Department of Civil Engineering, Oriental University, Indore, India
-------------------------------------------------------------------------***------------------------------------------------------------------------
Abstract - In the present scenario various multistory
building are constructed with floating column at various
locations for appealing view, for getting more space in
parking area for movement and for planning of different
plan at different stories. This paper present comparative
study about analysis of G + 14 story building with and
without floating column at various location within the
floors for periphery columns at various levels for seismic
zone V. The motive of this paper is to compare the
response of RC frame buildings with and without floating
columns under earthquake loading and under normal
loading. The effect of earthquake forces on various
building models for various parameters is proposed to be
carried out with the help of response spectrum analysis. A
comparative study of the results obtained is carried out for
all models. The building with floating columns at top
stories will provide optimum results for four cases.
Keywords- Floating column, multistory building,
seismic response, staad pro, response spectrum,
optimum case
1. INTRODUCTION
Now a day’s construction of building are becoming more
complex because of the requirement and usability of
building. There are different architectural plans
proposed for different floors in the same building
because of multiple use and to accommodate such
frames is becoming difficult as location of column will
create problem. Sometimes in residential building when
we need some aesthetic view or some extra space in
various floor for balconies, terrace since they are not
counted in Floor Space Index, also for portico in ground
floor for lavish view and in parking area we need some
extra column free space for easy movement of vehicles.
Also in some case we need to construct columnless
spaces in the lower stories and grid (residential
arrangement) spaces in higher stories. For all the above
scenario generally we will provide a cantilever type
arrangement for frame which refers to as frame with
floating column. But rational studies along with a
knowledge regarding the performance of building in
earthquakes reveals that such building would create
maladjustments in building space forming elements that
would not only decrease the seismoresistant capacity of
the building but also become the cause of failure of the
building.
1.1 Floating Column
A floating column also known as hanging column or stub
column, which is likely to be supported on either joints
or rest over the beam eccentrically without any support
below it. Generally a column in framed structure is
designed in such a way so as to transfer the load from
column to column of different story then to foundation
and finally to soil. While in case of floating column the
load is not directly transferred. These column will be
placed in such a way that it hangs on a base having no
fixed support to transfer the load to foundation
2. OBJECTIVE
From the earlier studies it is observed that the optimum
location of floating column in a building is not studied
which may not cause any harm even in highly seismic
prone areas. The prime objective of this work are:
1. To compare the Nodal displacement and Story drift
for all the models with or without floating column.
2. To compare maximum shear force, bending moment
in each story.
3. To compare the maximum axial force among all the
models.
4. To find out the optimum location of floating column
in a building frame.
3. METHODOLOGY AND STRUCTURAL MODELLING
A G+14 storied model of building is analyzed having 5
bays in x direction and 3 bays in z direction for a total of
13 cases with and without floating column at various
locations within the floor level and in different stories as
mentioned in table 1 and figure 1-13.
Using Indian Standard Code IS 1893 (part 1): 2002
various parameters are analyzed for various condition
under seismic zone V by response spectrum method.
For examining below cases “STAAD Pro V8i” is used for
analysis and following data is used for analyzing various
parameters under certain conditions as mentioned
below:

Table-1: Building Data
Table-2: Different cases with respect to building
configurations
S.No. Building Configuration Cases Abbre-
viation
1 Modelling and analysis of G+14
building without floating
column.
A
building with floating column at
all four corners in ground floor
only.
B
all four corners in G+3 only.
C
D
E
F
center of outer periphery all
around in ground floor only.
G
around in G+3 only.
H
I
around in G+6 only.
around in G+9 only.
J
around in G+12 only.
K
Fig. 1: Case A & Case B
Fig. 2: Case C & Case D
Parameter Assumed data
Soil type Medium Soil
Seismic zone V
Response reduction
factor
5
Importance factor 1
Height of building 45m
Floor to floor height 3m
Beam sizes 600mm X 550mm
Column sizes 600mm X 550mm
Material properties Concrete

Fig. 3: Case E & Case F
Fig. 4: Case G & Case H
Fig. 5: Case I & Case J
Fig. 6: Case K
4. RESULTS AND DISCUSSION
In the present study models are examined with
longitudinal as well as transverse direction of seismic
load as per Response Spectrum method of IS
1893:2002(part-1). Response spectrum analysis was
performed against various load with multiple load
combinations on all the model comprises of normal
structure and all the cases of structure with floating
column at various locations. Nodal displacement, story
drift, maximum shear force, maximum bending moment
and maximum axial forces was analyzed and compared
for various cases and result is shown in tables as well as
in graphical form also.
Table 3: Maximum Nodal displacement for various cases
CASE NODE DISPLACEMENT
A 93 166.266
B 91,379 226.705
C 91 205.946
D 91 190.496
E 91 175.903
F 94 166.815
G 94 188.649
H 93 183.230
I 93 177.37
J 93 172.003
K 93 167.446

Graph 1: Graphical representation of Nodal Displacement
for all cases
Table 4: Maximum Shear Force in Y & Z direction for
various cases
CASE SHEAR Y SHEAR Z
A 490.306 494.955
B 850.843 576.76
C 785.548 510.97
D 710.925 449.791
E 553.785 469.254
F 488.327 491.827
G 690.477 616.002
H 662.266 550.682
I 585.886 478.274
J 483.683 482.783
K 488.5 492.015
Graph 2: Graphical representation of Shear Force in Y & Z
direction
Table 5: Maximum Story Drift in X & Z direction for
various cases
C
A
S
E
FLOOR HEIGHT
MAXIMUM STORY DRIFT
X
DIRECTION
Z
DIRECTION
A
G+4 15 0.8308
G+6 21 0.6865
B G+1 6 1.1111
G+5 18 1.1391
C G+4 15 1.1709
G+6 21 1.1137
D G+7 24 1.0836
G+8 27 0.9601
E G+4 15 0.8283
G+10 33 0.7688
F G+4 15 0.8289
G+6 21 0.6841
G G+1 6 1.0316
G+1 6 0.8789
H G+4 15 1.0851
G+4 15 0.9709
I G+7 24 1.009
G+7 24 0.9368
J G+4 15 0.8284
G+10 33 0.7832
K
G+4 15 0.8291
G+6 21 0.6848
Graph 3: Graphical representation of Story Drift in X
direction for all cases
0
50
100
150
200
250
A B C D E F G H I J K
NODALDISPLACEMENT
CASE
0
100
200
300
400
500
600
700
800
900
SHEARFORCEinKN
SHEAR-Y SHEAR-Z
0
0.2
0.4
0.6
0.8
1
1.2
1.4
STORYDRIFTINXDIRECTION
CASE

Graph 4: Graphical representation of Story Drift in Z
direction for all cases
Table 6: Maximum Moment in Y & Z direction for
various cases
CASE MOMENT Y MOMENT Z
A 806.669 873.288
B 964.396 1324.449
C 853.436 1208.783
D 763.157 1103.196
E 764.224 873.232
F 801.271 869.578
G 1006.105 1220.33
H 853.436 1208.783
I 778.758 1010.272
J 785.817 860.838
K 801.624 869.987
Graph 5: Graphical representation of Moment in Y & Z
direction
Table 7: Maximum Axial forces for various cases
CASE
AXIAL
FORCE
CASE
AXIAL
FORCE
A 6046.366 G 8331.71
B 9800.924 H 7427.260
C 8314.849 I 6728.995
D 7026.771 J 6317.072
E 6272.933 K 6115.475
F 6109.898
Graph 6: Graphical representation of Axial Force for all
cases
5. CONCLUSIONS
Since till now studies has been carried out for general
condition of floating column but there had not been any
such case which gives the optimum location of floating
column within the building. On the basis of above
parameters following results are obtained from this
comparative study.
1. It has been concluded in this study, when columns as
a floating column are eliminated in G + 14 story
building at various location within the floors at
various levels for seismic zone V that Cases E, F, J &
K are seems to be most efficient case among all 11
cases.
2. On comparing it has been concluded that the
maximum Nodal displacement obtained for Cases F
& K with a minimum value of 166.815mm &
167.446mm respectively.
3. Comparing the Story drift for all cases in both
longitudinal and transverse direction, Cases E, F, J &
K are observed as most efficient.
4. On analyzing shear force and bending moment
values, Case “J” i.e. floating column at center of outer
0
0.2
0.4
0.6
0.8
1
1.2
STORYDRIFTINZDIRECTION
CASE
0
200
400
600
800
1000
1200
1400
BENDINGMOMENTINKNm
MOMENT-Y MOMENT-Z
0
2000
4000
6000
8000
10000
12000
AXIALFORCEINKN
CASE

periphery all around in G+9 only found to be
optimum for both X & Z direction among all cases.
5. As per comparative results, Cases E, F, J & K for axial
forces values are found to be nearly equal among all
the models.
REFERENCES
1. Badgire Udhav S., Shaikh A. N., Maske Ravi G.,
(2015), “Analysis of Multistorey Building with
Floating Column”, Volume 4, Issue No.9, ISSN:2319-
6890 pp : 475-478.
2. Jayashri Sarode, Mr. Amol S. Pote, (2016), “Analysis
Of Floating Column Building Of Composite and R.C.C
Beam Girder & Comparison with R.C.C Frame
Structure by Using Etabs V9.7.0.”, ISSN: 2320-5407,
pp 1464-1469.
3. Deekshitha R., Dr. H.S.Sureshchandra, (2017),
“Seismic analysis of multistory building with and
without floating column”, Volume 4, Issue 6, ISSN:
2395-0056, pp 2546-2550.
4. Hardik bhensdadia, Siddharth Shah, (2015),
“Pushover Analysis of RC Frame Structure with
Floating Column and Soft Story in Different
Earthquake Zones”, Volume 4, Issue 4, ISSN: 2319-
1163, pp 114-121.
5. Keerthi Gowda B. S, Syed Tajoddeen, (2014)
“Seismic Analysis of Multistorey Building with
Floating Columns”, pp 528-535
6. Nakul A. Patil, Riyaz Sameer Shah, (2016)
“Comparative Study of Floating and Non-Floating
Columns With and Without Seismic Behaviour”,
ISSN: 2348 – 8352, pp 29-33.
7. Pradeep D., Chethan V. R., Ashwini, B. T., (2017),
“Seismic Analysis of Multistory Building with
Floating Column using Etabs”, Volume 2, Issue 9,
ISSN: 2455-263, pp 110-116
8. S. B. Waykule et. al., (2016), “Study of Behaviour of
Floating Column for Seismic Analysis of Multistorey
Building”, Volume 7, Issue 6, ISSN Print: 0976-6308,
pp 676-685.
9. Snehal Ashok Bhoyar, (2017), “Effect of Floating
Column on Building Performance Subjected to
Lateral Load”, Volume 1 Issue 2, ISSN: 2456-8465,
pp 134-143.
10. Srikant.M.K.,Yogeendra.R.holebagilu,(2014),
“Seismic Response of Complex Building with
Floating Column for Zone II and Zone V ”, Volume 2,
Issue 4, ISSN: 2321-7758.
11. Waykule S. B., Kadam S. S, Lale S. V, (2016), “Review
on Study of Behavior of Floating Column For Seismic
Analysis of Multistorey Building”, International
Journal of Engineering Applied Sciences and
Technology, Volume. 1, Issue 10, ISSN No. 2455-
2143, pp 39-42.

IRJET- Optimum Location of Floating Column in Multistorey Building with Seismic Loading

Recommended

Recommended

More Related Content

What's hot

What's hot (19)

Similar to IRJET- Optimum Location of Floating Column in Multistorey Building with Seismic Loading

Similar to IRJET- Optimum Location of Floating Column in Multistorey Building with Seismic Loading (20)

More from IRJET Journal

More from IRJET Journal (20)

Recently uploaded

Recently uploaded (20)

IRJET- Optimum Location of Floating Column in Multistorey Building with Seismic Loading